Addressable Loop Wiring - Zeta NPAD 2 Installation Manual

PREMIER AD INSTALLATION MANUAL.

7 ADDRESSABLE LOOP WIRING

The Premier AD comes with two addressable loops. Addressable detectors, addressable call points, addressable
loop powered sounders and several other interface units can be connected to these loops. A MAXIMUM OF 126
DEVICES CAN BE CONNECTED TO EACH LOOP. We recommend that the first and last devices on a loop have
isolator bases fitted. Also the last device on each zone should have an isolator fitted. This is to prevent a short
circuit fault in one zone effecting another zone.
SIDE A +VE
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SIDE A -VE
SIDE B +VE
SIDE B -VE
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A maximum of 32 loop-powered addressable sounders or sounder bases are permitted on the loop. On the Premier
AD Panel, all Sounder Bases are always configured as common sounders.
Short circuit isolators should be used to prevent loosing the whole loop in the event of a single short circuit fault.
They should be fitted to each zone boundary, such that any short circuit will only affect the devices in 1 zone.
The termination of each wiring circuit must be as indicated on the main PCB (See page 31). The Earthing of the
cable screens should be as shown on page 17
Pre-Commissioning Cable Checks
1. +ve in to +ve out less than 24 ohms
2. -ve in to -ve out less than 24 ohms (may need to temporarily disable isolators to measure)
3. +ve to –ve greater than 500k ohm
4. +ve to Earth greater than 1M ohm.
5. -ve to Earth greater than 1M ohm.
6. +ve to –ve less than 50 mV pickup (on AC & DC scales)
Approved Document No: GLT.MAN-105A
Issue : 2.02 Authorised: GH
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Date: 16/07/2007
Software:PANEL:R1107 & LOOP:R1062
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Smoke Detector
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Loop Isolator Base
Heat Detector
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Call Point
Sounder
Note that some Devices
(for example, a sounder
controller circuit) may
require a separate 24
volt supply to operate.
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